Contoured surface cover plate for image sensor array

• US 7,133,076 B1
• Filed: 12/22/1999
• Issued: 11/07/2006
• Est. Priority Date: 12/24/1998
• Status: Expired due to Fees

• Current Assignee: Round Rock Research LLC
• Original Assignee: Micron Technology, Inc.
• Inventors: Campbell, Scott
• Primary Examiner(s): Ho, Tuan
• Assistant Examiner(s): SELBY, GEVELL V
• Application Number:
  US09/470,284
• Time in Patent Office: 2,512 Days
• Field of Search: 348/340, 348/385, 348/335, 257/222, 257/239
• US Class Current: 348/340
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof

Abstract

A cover for an image sensor array is disclosed. The cover includes a plate formed of substantially transparent material and placed adjacent to the image sensor array. The plate has a plurality of surfaces and forms a lensing structure. At least one of the plurality of surfaces is contoured into a lensing surface capable of performing an imaging improvement or enhancement function.

Claims

1. A cover for an image sensor array, the cover comprising:

a plate formed of substantially transparent material and secured adjacent to an upper surface of and covering the image sensor array, said sensor array being sealed by said plate, said plate having a plurality of surfaces forming a lensing structure, such that at least one of said plurality of surfaces is contoured into a lensing surface capable of changing imaging characteristics; and

a mounting structure extending from an upper surface of the plate and adapted to secure a prefabricated lens system to the plate above the lensing structure.

2. The cover of claim 1, wherein said plate is made of a transparent material which is one of glass, plastic, or plexiglass, said plate being transparent over all, or a substantial portion of, the image sensor array.

3. The cover of claim 1, wherein said lensing structure is made of at least one lensing element, said lensing structure covering all or a substantial portion of the image sensor array, such that said at least one lensing element is formed on the lensing surface.

4. The cover of claim 3, wherein said at least one lensing element is a refractive lensing element.

5. The cover of claim 4, wherein said refractive lensing element includes a concave lens.

6. The cover of claim 4, wherein said refractive lensing element includes a convex lens.

7. The cover of claim 4, wherein said refractive lensing element forms a post having at least one lensing surface.

8. The cover of claim 3, wherein said at least one lensing element is a diffractive lensing element, said diffractive lensing element blazed on the lensing surface.

9. The cover of claim 3, wherein said at least one lensing element is a hybrid refractive-diffractive lensing element, said hybrid lensing element being formed with a diffraction grating blazed on the refractive lensing surface.

10. The cover of claim 1, wherein said lensing structure also includes an alignment mark, formed on the lensing surface, to guide the prefabricated lens system being attached to the plate.

11. The cover of claim 1, wherein said mounting structure is formed by a mesa-like protrusion on the lensing surface.

12. The cover of claim 1, wherein said mounting structure is formed by a ringed-wall structure having an inside wall and an outside wall, said ringed-wall structure formed on the lensing surface.

13. The cover of claim 12, further comprising a threaded retaining ring on the inside wall for attaching the prefabricated lens system to the plate.

14. The cover of claim 12, further comprising a threaded retaining ring on the outside wall for attaching the prefabricated lens system to the plate.

15. The cover of claim 12, wherein said mounting structure is formed by a well-like depression on the lensing surface.

16. The cover of claim 15, further comprising a threaded retaining ring on the inside wall of the depression for attaching the prefabricated lens system to the plate.

17. The cover of claim 1, wherein the mounting structure extending from the upper surface of the plate is adapted to removably secure the prefabricated lens system to the plate above the lensing structure.

18. The cover of claim 1, wherein said plate and said mounting structure comprise a unitary structure.

19. A method of making an image sensor array having a lensing cover plate, the method comprising:

forming a lensing structure on a lensing surface of a flat, substantially transparent cover plate by contouring said lensing surface of the cover plate into a lensing element to form said lensing cover plate;

securing a mounting structure to an upper surface of the plate, said mounting structure being adapted to connect a prefabricated lens system to the plate above the lensing structure; and

covering an image sensor array with said lensing cover plate such that said image sensor array is sealed by said cover plate.

20. The method of claim 19, wherein forming a lensing structure includes forming a diffraction grating on said lensing surface.

21. The method of claim 19, wherein said lensing structure and said cover plate are injection molded as a single-piece structure.

22. The method of claim 19, wherein said mounting structure is adapted to removably connect the prefabricated lens system to the plate above the lensing structure.

23. A method of making a camera system, comprising:

contouring a portion of a flat cover plate to form a cover plate having a lensing structure;

securing a mounting structure to an upper surface of the plate, said mounting structure being adapted to connect a prefabricated lens system to the plate mounting above the lensing structure;

covering an imaging array with said cover plate, said cover plate being placed in an optical path of said camera system; and

bonding the cover plate to an assembly to seal the imaging array.

24. A method as in claim 23, wherein contouring the cover plate to form the lensing structure includes forming at least one of a refractive lens or a diffractive lens.

25. A method as in claim 23, wherein covering the imaging array with said cover plate includes locating said cover plate adjacent said imaging array.

26. A method as in claim 23, further comprises locating at least one additional lensing element in said optical path of said camera.

27. A method as in claim 26, wherein said at least one additional lensing element is mounted to said cover plate.

28. The method of claim 23, wherein said mounting structure is adapted to removably connect the prefabricated lens system to the plate mounting above the lensing structure.